Massey Ferguson 520217.31 – Engine Control Unit (ECU): ECU internal fault 0110 / ROM-memory error

The engine computer has detected a critical internal memory or processing failure during its self-diagnostic checks (MOCSOP - Test of redundant shut-off paths).

• 4710
• 7724S
• 5712SL
• Interim Tier 4 (2012-2015)
• 7722
• 7722S
• 7615
• 5613
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7616
• 7618
• 5608
• 4708
• 7619
• 7626
• 7726S
• 7624
• 4707
• 4709
• 5711SL
• 7614
• 7718S
• 5610
• 7620
• 7719
• 7714
• 7716S
• T4 (2015-2021)
• 5612
• 7622
• 7720
• Tier 4 (2015-2021)
• 5611
• 7715S
• 5609
• 7724
• MF 7700 Series
• MF 7722
• MF 8400 Series
• MF 6400 Series
• Dyna-4 transmission models

1. 1

   Verify Power and Ground: Check the main power feeds and ground connections to the Engine ECU. Severe voltage drops or electrical spikes can sometimes cause memory check anomalies.

2. 2

   Check CAN Bus Communication: Ensure there are no CAN communication timeouts or overruns that might be corrupting data.

3. 3

   Clear and Retest: Connect the AGCO Electronic Diagnostic Tool (EDT) or WinEEM3/WinEEM4 Service Tool. Attempt to clear the code. If the code immediately returns as 'Active,' the ECU's internal ROM is permanently corrupted or physically damaged.

1. 1

   Connect diagnostic tool

   Connect the AGCO EDT (Electronic Diagnostic Tool) to the machine's diagnostic port.

2. 2

   Select ECU replacement

   Navigate to "Configuration" and select "Engine ECU Replacement".

3. 3

   Extract configuration data

   Push the start button and follow the on-screen prompts to extract any recoverable configuration data from the old unit.

4. 4

   Disconnect power

   Turn off the ignition and disconnect the tractor's battery.

5. 5

   Disconnect wiring

   Disconnect the wiring harnesses (typically two large multi-pin connectors) from the EEM4 unit.

6. 6

   Remove faulty ECU

   Unbolt and remove the faulty ECU from its mounting bracket.

7. 7

   Install new ECU

   Install the new EEM4 ECU and reconnect the wiring harnesses and battery.

8. 8

   Program new ECU

   Return to the EDT software and follow the automated instructions to activate and program the new EEM4 unit to the tractor's specific engine serial number and ID module.